Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/themes/stark/README.txt

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+
+ABOUT STARK
+-----------
+
+The Stark theme is provided for demonstration purposes; it uses Drupal's
+default HTML markup and CSS styles. It can be used as a troubleshooting tool to
+determine whether module-related CSS and JavaScript are interfering with a more
+complex theme, and can be used by designers interested in studying Drupal's
+default markup without the interference of changes commonly made by more
+complex themes.
+
+To avoid obscuring CSS added to the page by Drupal or a contrib module, the
+Stark theme itself has no styling.
+
+
+ABOUT DRUPAL THEMING
+--------------------
+
+To learn how to build your own custom theme and override Drupal's default code,
+see the Theming Guide: https://www.drupal.org/theme-guide
+
+See the themes/README.txt for more information on where to place your
+custom themes to ensure easy maintenance and upgrades.

core/themes/stark/config/schema/stark.schema.yml

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+# Schema for the configuration files of the Stark theme.
+
+stark.settings:
+  type: theme_settings
+  label: 'Stark settings'

core/themes/stark/logo.svg

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core/themes/stark/stark.breakpoints.yml

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+stark.mobile:
+  label: mobile
+  mediaQuery: '(min-width: 0px)'
+  weight: 2
+  multipliers:
+   - 1x
+stark.narrow:
+  label: narrow
+  mediaQuery: 'all and (min-width: 480px) and (max-width: 959px)'
+  weight: 1
+  multipliers:
+    - 1x
+stark.wide:
+  label: wide
+  mediaQuery: 'all and (min-width: 960px)'
+  weight: 0
+  multipliers:
+    - 1x

core/themes/stark/stark.info.yml

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+name: Stark
+type: theme
+description: 'An intentionally plain theme with no styling to demonstrate default Drupal’s HTML and CSS. Learn how to build a custom theme from Stark in the <a href="https://www.drupal.org/theme-guide">Theming Guide</a>.'
+package: Core
+version: VERSION
+core: 8.x

core/themes/stark/stark.libraries.yml

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+global-styling:
+  version: VERSION
+  css:
+    base:
+      css/layout.css: {}